Mission Characteristics

  Item               CCE                   IRM                    UKS
-----------   ------------------    ------------------    ------------------
Launch Date      Aug. 16, 1984         Aug. 16, 1984         Aug. 16, 1984
Status        Terminated 7/14/89    Terminated 8/13/86    Terminated 1/16/85
Apogee               8.8 Re              18.8 Re               18.8 Re
Perigee             1100 km               550 km                550 km
Inclination         4.8 deg              28.8 deg              28.8 deg
Period             15.6 hours           44.3 hours           44.3 hours
Spin Vector      In orbit plane      Slowly torqued to    Normal to Ecliptic
              10-20 deg off of sun   Normal to Ecliptic    
Spin Rate           10.2 rpm             13.6 rpm               12 rpm